Black mica mica minerals in a, for silicate minerals. Biotite is
mainly produced in metamorphic rocks, granite and other rocks in
there. Black mica color from black to brown, red or green, a shiny
glass. Shape of plate shape, columnar. In recent years, black mica
is also widely used in stone and other decorative coatings.
Black mica water solution effects can be altered to chlorite,
muscovite and mica and other minerals. Black mica with high iron
content, poor insulation, far less muscovite. Larger particle size
black mica, easily according to the lamellar morphology, darker
color and elasticity, with mica perfect cleavage, and heated, can
be slightly magnetic characteristics to differentiate in the
plutonic and hypabyssal rocks clock, particularly acidic or
alkaline rocks, mostly containing black mica.
Widely used in building materials industry, the fire industry, fire
extinguishing agent, welding, plastic, electrical insulation,
paper, paper, rubber, paint, coatings, pearlescent pigments and
other chemical industry. Ultra-fine mica powder as plastics,
coatings, paints, rubber and other functional fillers, which can
improve its mechanical strength, enhanced toughness, adhesion and
corrosion resistance and anti aging. In addition to having high
electrical insulating resistance, acid and alkali corrosion
resistance, elasticity, toughness and sliding resistance,
heat-resisting, small thermal expansion coefficient and other
properties, and launched the first film body two smooth surface,
than large diameter thick, morphological rules, strong adhesion
【the physical properties】
Biotite mica crystal morphology and the same. Color is black, dark
brown, sometimes with reddish, greenish or other color. Titanium
containing high is reddish brown, contain high iron green.
Transparent to opaque. Vitreous luster, black is a semi metallic
luster. Hardness23, proportion3.023.12.